<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>html基础语法</title>
  <style>
    img{
      width: 200px;
    }
    .my-video{
      width: 400px;
    }
  </style>
</head>
<body>
  <div>hello world</div>
  <p>ppppppp</p>
  <span>sssss</span>
  <a href="https://www.baidu.com">去百度</a>

  <ul>
    <li>html</li>
    <li>css</li>
    <li>js</li>
  </ul>

  <ol>
    <li>html</li>
    <li>css</li>
    <li>js</li>
  </ol>

  <h1>h1</h1>
  <h2>h2</h2>
  <h3>h3</h3>
  <h4>h4</h4>
  <h5>h5</h5>
  <h6>h6</h6>


  <img src="https://t7.baidu.com/it/u=1732966997,2981886582&fm=193&f=GIF" alt="">
  <audio src="http://music.163.com/song/media/outer/url?id=447925558.mp3"></audio>
  <video class="my-video" controls src="http://video.chinanews.com/flv/2019/04/23/400/111773_web.mp4"></video>

</body>
</html>